Re: Comments on draft-stark-expect-ct-00
Eric Rescorla <ekr@rtfm.com> Tue, 15 November 2016 04:58 UTC
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From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 15 Nov 2016 13:53:32 +0900
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To: Emily Stark <estark@google.com>
Cc: HTTP Working Group <ietf-http-wg@w3.org>
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Subject: Re: Comments on draft-stark-expect-ct-00
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On Tue, Nov 15, 2016 at 10:50 AM, Emily Stark <estark@google.com> wrote: > > >> (https://groups.google.com/d/msg/mozilla.dev.security. > policy/VJYX1Wnnhiw/ZaJBaKfKBQAJ). > >> That is, eventually, when browsers require CT for all certificates, > >> site owners will have to face this same problem of making sure that > >> all their certificate chains are compliant with the CT policies of all > >> the UAs that they care about. So I guess I see the interop problem as > >> somewhat separate, perhaps something that should be addressed on its > >> own when the CT ecosystem and implementations have matured enough that > >> UAs are able to standardize on one policy...? > >> > >> To put it another way, I see Expect-CT as a way that individual sites > >> can opt in to the future early ("the future" being when browsers > >> require CT for all certificates), and the future is quite possibly > >> different policies in different browsers, at least for some amount of > >> time. > > > > > > The problem is that as written the future is likely to involve a lot of > > bustage. > > I feel like maybe I'm not understanding what you'd like to see > instead. Are you arguing that the Expect-CT draft should contain a > policy like "all EE certs must come with 2 SCTs from different logs", > even if that policy differs from what different browsers plan to > actually enforce for new certificates? Or that browsers shouldn't > require CT for all certificates until they standardize on such a > policy? > I'm arguing that we shouldn't define a header that says "you must enforce CT" without defining what "enforce CT" means. -Ekr > > > > > >> > S 2.1.3. > >> > What's the rationale for not caching the directive in report-only > mode. > >> > If the purpose of the report-only mode is to tell you when you have > >> > nonconforming servers, then don't you want to be able to turn it on > >> > on server A and detect hwen server B is broken? That seems like it > >> > doesn't work if you don't cache. > >> > >> I'm tempted to say "because that's how HPKP does it", but that's > >> probably not the answer you're looking for. :) I'd expect that sites > >> would generally serve the report-only header on all responses > >> unconditionally. I can't really think of a common misconfiguration > >> scenario that would cause a CT violation and would *also* cause the > >> header to not be served, but maybe that's a failure of imagination on > >> my part. > > > > > > Two different independent servers with the same name behind > > a load balancer? Or a server farm where policies are rolled out slowly. > > > > -Ekr > > > >> > >> > >> > > >> > -Ekr > >> > > >
- Comments on draft-stark-expect-ct-00 Eric Rescorla
- Re: Comments on draft-stark-expect-ct-00 Tom Ritter
- Re: Comments on draft-stark-expect-ct-00 Emily Stark
- Re: Comments on draft-stark-expect-ct-00 Tom Ritter
- Re: Comments on draft-stark-expect-ct-00 Emily Stark
- Re: Comments on draft-stark-expect-ct-00 Eric Rescorla
- Re: Comments on draft-stark-expect-ct-00 Emily Stark
- Re: Comments on draft-stark-expect-ct-00 Eric Rescorla
- Re: Comments on draft-stark-expect-ct-00 Emily Stark
- Re: Comments on draft-stark-expect-ct-00 Eric Rescorla
- Re: Comments on draft-stark-expect-ct-00 Nick Sullivan
- Re: Comments on draft-stark-expect-ct-00 Emily Stark